Let It Breathe: The Best Test Pipes for G35 Coupe & Sedan

A catalytic converter can be a power-draining part of your G35’s exhaust system, not to mention heavy. Removing it in favor of test pipes will bring life back to your car with more power, torque and better fuel economy.

This is definitely not a Infiniti G35 modification for everyone. But if you’re taking your car to the track or have no regard for the law (hey, we’re not here to judge), this is probably one of the best value modifications you can make to your G.

If you’re going to remove your G35’s catalytic converters, you’ll want to replace them with test pipes that help your car the most. This guide is here to set you up with the best G35 test pipes.

Down Pipe vs Test Pipe vs Straight Pipe

There’s some confusion between different countries and manufacturers around what these different terms mean.

In turbocharged cars, a “down pipe” is usually the name given to a pipe that comes straight off of the turbo. In standard form though, your Infiniti G35 isn’t turbocharged, but many manufacturers still use the term “down pipe”.

“Straight pipes” are what they sound like – a straight through pipe without any sort of resonator or anything tricky about them. They’re simple, and exactly what test pipes used to be.

So, for the purposes of this guide, you can consider them to all mean the same thing.

Infiniti G35 Test Pipe Construction

A test pipe is a straight-through pipe which replaces your catalytic converter.

You don’t need to spend a ton of money unless you’re looking for something resonated. Or a nice, polished finish.

Each test pipe is specified by its inlet diameter (in inches), its outlet diameter (also in inches), its construction type (typically steel), and the welding.

Some of these test pipes also come with limited manufacturer warranties. Do know though, outside of the welds cracking, there’s not a lot to go wrong, so we don’t put too much weight in the warranty.

Resonated vs. Non-Resonated Test Pipes

Resonated test pipes are simply built to get rid of rasp, thus reducing volume/loudness. With resonated test pipes, you will get more of a deep tone.

Non-resonated test pipes tend to hiss and be raspier. They are much louder.

Trade-Offs of Adding G35 Test Pipes

When you add test pipes to your G35, you want to get as little rasp as possible. It’s recommended to get an X-pipe if you want to steer clear of the drone and rasp that comes with replacing your G35 catalytic converter with test pipes.

The right test pipes for your G35 should cut down on rasp as well as exhaust fumes.

People tend to forget that when installing test pipes, you also have to watch out for the smell.

If the piping inlet and outlet diameters don’t match your G35 as well as they could, the test pipes could rattle and drone and could emit unpleasant odors.

Cheap G35 test pipes are often just as good as the more expensive test pipes. Usually the difference in price is all about precision – how nicely they match up to the rest of your exhaust system, and how good the welds are.

Bad welds = cracking. Not something you want to see.

Cheap test pipes are usually cheap because they aren’t as nice of a fit, but if you’re happy to use some muscle and man handle them into place you can often get a perfectly good piece of pipe for a fraction of the price.

Best Test Pipe For G35 Coupes and Sedans

Most major aftermarket manufacturers make test pipes for G35 coupes and sedans. Not all of them are created equal, of course, and price isn’t always the telling figure.

It’s important to understand how the inlet/outlet diameters match up with your car, so you don’t accidentally get the wrong component. It’s also important to know how the pipe is welded and what it’s built from, so you know you’re not getting something flimsy that you’ll regret.

Generally we like test pipes that are around 2.25″ in diameter. 2.5″ is the most we’d ever consider on a street driven car to avoid unnecessary drone.

Anything larger than that and your car should be a turbocharged or supercharged beast!

Inexpensive G35 Test Pipes

The test pipes below all ring in for less than three figures. Even though they’re inexpensive, don’t write them off.

There are some great quality units available in this price range.

These Infiniti G35 test pipes are sorted by price, from lowest to highest. They will give you some of the best bang for your buck in terms of performance increases with minimal drone and smell.

Why they call these things “turbo downpipes”, we have no idea. It’s as if they are trying to confuse you into buying a competitors’ products.

They work on a non-turbo Infiniti G35 and will bolt onto your otherwise stock exhaust system (if that is what you want to do).

These downpipes are way lighter than the stock cats, and can increase power output by up to 15 horsepower. This makes them comparable to much more expensive test pipes, but for a fraction of the cost.

There have been reports that the gaskets provided blow out easily, sometimes within 3,000 miles but we’ve never seen this in person.

Do know that installation is easier if you bring your own, longer bolts too.

These are non-resonated pipes, so you might hear some rasp with them, but it isn’t a “ricey” rasp. That being said, you will hear a slight drone from 4,000 RPM to redline, though there shouldn’t be any rasp, hiss, or drone below 3,000 RPM.

Berk Technology Test Pipe

Berk Technology’s downpipes come with a built-in O2 CEL fix, which works about 95% of the time. Another cool feature of the Berk pipes are the O2 tapped hole on each pipe, which allows you to easily bolt on O2 sensors.

These are straight pipes and are not fitted with a resonator, so you can expect a raspier note than you would hear with the standard catalytic converters.

These are some of the best G35 test pipes at a mid-level price, and are well known to most G35 drivers and tuners.

Best Test Pipes for G35 Coupes and Sedans

When deciding which aftermarket test pipe you want, and what will be best for your Infiniti or Nissan G35, you need to ask yourself what you’re looking for: the best performance, the best value, or the best price? Luckily, we have all three categories covered below.

Best G35 Test Pipe for Performance:Motordyne ART Test Pipes If money were no issue, everyone would be using the Motordyne ART test pipes with their G35 coupe or sedan. they aren’t cheap, but are arguably the the best aftermarket test pipes you can put on a G35.

Cheap G35 Test Pipes:Auto Dynasty Turbo Downpipe If you’re trying to get an inexpensive test pipe that will still do the job it’s supposed to do, go with Auto Dynasty’s test pipes. They have one of the highest satisfaction records, they’ll give you a nice sound and performance increase, and won’t break the bank.

Our Fav G35 Test Pipe:Megan Racing Downpipe In terms of bang-for-your-buck, while offering a ton of performance, Megan Racing’s units area good combination. Loads of G35’s are rolling around with these test pipes for a reason. These may well be the top test pipe for G35s on the market.

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